I'm assuming you've already read this guide: https://qtum.bizhongchou.com/guide.pdf

It's not bad, but it leaves a few things out if you're not a Chinese citizen. If you do not have advanced certification, you will need to upload a front and back picture of your ID. After you do that, and it is verified, you will need to go back to that page and upload a picture of you holding your ID. Then, you will be allowed to withdraw. If you are already verified, and are only struggling with withdrawing, here are the steps to do so (all assuming you have the page translated using the google's tool):

1) login

2) go to https://bizhongchou.com/account-money_carry_bank.html

3) Click add address under "QTUM/BYTOM/DPY etc" category

4) Fill in the necessary info (it is a community stock DCS), and confirm through your email

5) go to https://bizhongchou.com/account-money_carry_bank.html

6) Click where you see the name of the address added, which is above the withdraw, and view/delete categories

7) Click "present" on the right side of the screen

8)Click again on where you see the name of the address that you added. This will bring you to the withdrawal screen. If you accidentally click view or withdraw, start back from step 6.

9) Number of copies is the place where you fill in the amount you wish to withdraw. Fill this in, get email verification code, use payment password, and your transaction should go through in about 24 hours (in my experience at least). You must withdraw at least 1 Qtum, and there is a 0.1 Qtum fee. I recommend withdrawing once to make sure everything goes through as expected before withdrawing the rest. I used MyEtherWallet and this worked for me. You have to add Qtum as a custom token, if you haven't already.